Pneumatics & Brake System Flashcards
What is Main Reservoir operating pressure? +-20
850-1000kPa
What is Emergency BC pressure?
280-460kPa
What is Maximum BC Pressure
250-380kPa
What is Holding BC Pressure
140-240kPa
What is Main Reservoir safety valve pressure?
1050kPa
What is Main Reservoir Safety Loop activation pressure?
600kPa
What is the ASU?
Air Supply Unit
Air Supply Unit Equipment Case
(not required to be inspected)
What does the ASU consist of?
Main air compressor
Air Dryers
Filters
Backup Compressor Governor
How many air compressors does a 7 car HCMT have?
Two
One in each Tc car
What does the Auxiliary Compressor do?
Raises pantographs when:
There is insufficient MR pressure
When car has been isolated from MR
Where is Auxiliary Compressor located?
DMp cars
If pantograph isolating cock is isolated on DMp car the pantograph will not be isolated. they will remain raised in the absence of MR air
Pg. 13
What Air Reservoirs are there on a HCMT
Main Reservoirs
Surge Reservoirs - supplies air to airbag, one for every air bag
Brake Supply reservoirs
What does the Brake Supply Reservoir do?
Supplies compressed air to the EP valves in the BCM to charge the BCs
How can pantographs be raised? (2)
MR pressure above 700kPa
Battery operatedAuxiliary compressor when insufficient MR pressure
How many pantograph ICs are there on DMp and Mp cars?
Saloon
and
Underframe